Tricyclic heterocycles as BET protein inhibitors

1. A method of treating a BET-mediated cancer, by inhibiting a BET protein, wherein the cancer is leukemia, lymphoma, multiple myeloma, brain cancer, neuroblastoma, carcinoma, skin cancer, lung cancer, or prostate cancer, comprising administering to a patient in need of such treatment a therapeutically effective amount of a compound of Formula I:

or a pharmaceutically acceptable salt thereof, wherein:

X is N;

Y is CR 5 ;

L is C 1-6 alkylene, optionally substituted by 1, 2, or 3 substituents independently selected from F, Cl, OH, C 1-4 alkoxy, CF 3 , and CN;

Cy is C 6-10 aryl, C 3-10 cycloalkyl, 5-10 membered heteroaryl, 4-10 membered heterocycloalkyl, each of which is optionally substituted by 1, 2, or 3 R Cy ;

R 1 is H, C 1-6 alkyl, cyclopropyl, cyclobutyl, C 2-6 alkenyl, C 2-6 alkynyl, C 1-6 haloalkyl, or C 1-6 hydroxyalkyl;

R 2 and R 3 are each independently selected from H, halo, C 1-6 alkyl, C 2-6 alkenyl, C 2-6 alkynyl, C 1-6 haloalkyl, CN, NO 2 , OR a , SR a , C(O)R b , C(O)NR c R d , C(O)OR a , OC(O)R b , OC(O)NR c R d , NR c R d , NR c C(O)R b , NR c C(O)OR a , NR c C(O)NR c R d , C(═NR e )R b , C(═NR e )NR c R d , NR c C(═NR e )NR c R d , NR c S(O)R b , NR c S(O) 2 R b , NR c S(O) 2 NR c R d , S(O)R b , S(O)NR c R d , S(O) 2 R b , and S(O) 2 NR c R d ; wherein said C 1-6 alkyl, C 2-6 alkenyl, and C 2-6 alkynyl are each optionally substituted with 1, 2, 3, 4, or 5 substituents independently selected from halo, CN, NO 2 , OR a , SR a , C(O)R b , C(O)NR c R d , C(O)OR a , OC(O)R b , OC(O)NR c R d , C(═NR e )NR c R d , NR c C(═NR e )NR c R d , NR c R d , NR c C(O)R b , NR c C(O)OR a , NR c C(O)NR c R d , NR c S(O)R b , NR c S(O) 2 R b , NR c S(O) 2 NR c R d , S(O)R b , S(O)NR c R d , S(O) 2 R b , and S(O) 2 NR c R d ;

R 5 is H, halo, C 1-4 alkyl, C 2-4 alkenyl, C 1-4 haloalkyl, OR a2 , C(O)R b2 , C(O)NR c2 R d2 , C(O)OR a2 , NR c2 R d2 , NR c2 C(O)R b2 , NR c2 C(O)OR a2 , NR c2 C(O)NR c2 R d2 , NR c2 s(O)R b2 , NR c2 S(O) 2 R b2 , NR c2 s(O) 2 NR c2 R d2 , S(O)R b2 , S(O)NR c2 R d2 , S(O) 2 R b2 , or S(O) 2 NR c2 R d2 ;

each R Cy is independently selected from halo, C 1-6 alkyl, C 2-6 alkenyl, C 2-6 alkynyl, C 1-6 haloalkyl, C 6-10 aryl, C 3-10 cycloalkyl, 5-10 membered heteroaryl, 4-10 membered heterocycloalkyl, C 6-10 aryl-C 1-4 alkyl, C 3-10 cycloalkyl-C 1-4 alkyl, (5-10 membered heteroaryl)-C 1-4 alkyl, (4-10 membered heterocycloalkyl)-C 1-4 alkyl, CN, NO 2 , OR a3 , SR a3 , C(O)R b3 , C(O)NR c3 R d3 , C(O)OR a3 , OC(O)R b3 , OC(O)NR c3 R d3 , NR c3 R d3 , NR c3 C(O)R b3 , NR c3 C(O)OR a3 , NR c3 C(O)NR c3 R d3 , C(═NR e3 )R b3 , (═NR e3 )NR c3 R d3 , NR c3 C(═NR e3 )NR c3 R d3 , NR c3 S(O)R b3 , NR c3 S(O) 2 R b3 , NR c3 S(O) 2 NR c3 R d3 , S(O)R b3 , S(O)NR c3 R d3 , S(O) 2 R b3 , and S(O) 2 NR c3 R d3 ; wherein said C 1-6 alkyl, C 2-6 alkenyl, C 2-6 alkynyl, C 6-10 aryl, C 3-10 cycloalkyl, 5-10 membered heteroaryl, 4-10 membered heterocycloalkyl, C 6-10 aryl-C 1-4 alkyl, C 3-10 cycloalkyl-C 1-4 alkyl, (5-10 membered heteroaryl)-C 1-4 alkyl, and (4-10 membered heterocycloalkyl)-C 1-4 alkyl are each optionally substituted with 1, 2, 3, 4, or 5 substituents independently selected from halo, C 1-6 alkyl, C 2-6 alkenyl, C 2-6 alkynyl, C 1-6 haloalkyl, CN, NO 2 , OR a3 , SR a3 , C(O)R b3 , C(O)NR c3 R d3 , C(O)OR a3 , OC(O)R b3 , OC(O)NR c3 R d3 , C(═NR e3 )NR c3 R d3 , NR c3 C(═NR e3 )NR c3 R d3 , NR c3 R d3 , NR c3 C(O)R b3 , NR c3 C(O)OR a3 , NR c3 C(O)NR c3 R d3 , NR c3 S(O)R b3 , NR c4 S(O) 2 R b3 , NR c3 S(O) 2 NR c3 R d3 , S(O)R b3 , S(O)NR c3 R d3 , S(O) 2 b3 , and S(O) 2 NR c3 R d3 ;

each Cy 1 is independently selected from C 6-10 aryl, C 3-10 cycloalkyl, 5-10 membered heteroaryl, and 4-10 membered heterocycloalkyl, each of which is optionally substituted by 1, 2, 3, 4, or 5 substituents independently selected from halo, C 1-6 alkyl, C 2-6 alkenyl, C 2-6 alkynyl, C 1-6 haloalkyl, CN, NO 2 , OR a5 , SR a5 , C(O)R b5 , C(O)NR c5 R d5 , C(O)OR a5 , OC(O)R b5 , OC(O)NR c5 R d5 , NR c5 R d5 , NR c5 C(O)R b5 , NR c5 C(O)OR a5 , NR c5 C(O)NR c5 R d5 , C(═NR e5 )R b5 , C(═NR e5 )NR c5 R d5 , NR c5 C(═NR e5 )NR c5 R d5 , NR c5 S(O)R b5 , NR c5 S(O) 2 R b5 , NR c5 S(O) 2 NR c5 R d5 , S(O)R b5 , S(O)NR c5 R d5 , S(O) 2 R b5 , and S(O) 2 NR c5 R d5 ; wherein said C 1-6 alkyl, C 2-6 alkenyl, and C 2-6 alkynyl are each optionally substituted with 1, 2, 3, 4, or 5 substituents independently selected from halo, C 1-6 haloalkyl, CN, NO 2 , OR a5 , SR a5 , C(O)R b5 , C(O)NR c5 R d5 , C(O)OR a5 , OC(O)R b5 , OC(O)NR c5 R d5 , C(═NR e5 )NR c5 R d5 , NR c5 C(═NR e5 )NR c5 R d5 , NR c5 R d5 , NR c5 C(O)R b5 , NR c5 C(O)OR a5 , NR c5 C(O)NR c5 R d5 , NR c5 S(O)R b5 , NR c5 S(O) 2 R b5 , NR c5 S(O) 2 NR c5 R d5 , S(O)R b5 , S(O)NR c5 R d5 , S(O) 2 R b5 , and S(O) 2 NR c5 R d5 ;

each R a , R b , R c , R d , R a2 , R b2 , R c2 , R d2 , R a3 , R b3 , R c3 , R d3 , R c4 , R a5 , R b5 , R c5 , and R d5 is independently selected from H, C 1-6 alkyl, C 1-4 haloalkyl, C 2-6 alkenyl, C 2-6 alkynyl, C 6-10 aryl, C 3-10 cycloalkyl, 5-10 membered heteroaryl, 4-10 membered heterocycloalkyl, C 6-10 aryl-C 1-6 alkyl, C 3-10 cycloalky-C 1-6 alkyl, (5-10 membered heteroaryl)-C 1-6 alkyl, and (4-10 membered heterocycloalkyl)-C 1-6 alkyl, wherein said C 1-6 alkyl, C 2-6 alkenyl, C 2-6 alkynyl, C 6-10 aryl, C 3-10 cycloalkyl, 5-10 membered heteroaryl, 4-10 membered heterocycloalkyl, C 6-10 aryl-C 1-6 alkyl, C 3-10 cycloalky-C 1-6 alkyl, (5-10 membered heteroaryl)-C 1-6 alkyl, and (4-10 membered heterocycloalkyl)-C 1-6 alkyl is optionally substituted with 1, 2, 3, 4, or 5 substituents independently selected from C 1-4 alkyl, C 1-4 haloalkyl, halo, CN, OR a6 , SR a6 , C(O)R b6 , C(O)NR c6 R d6 , C(O)OR a6 , OC(O)R b6 , OC(O)NR c6 R d6 , NR c6 R d6 , NR c6 C(O)R b6 , NR c6 C(O)NR c6 R d6 , NR c6 C(O)OR a6 , C(═NR e6 )NR c6 R d6 , NR c6 C(═NR e6 )NR c6 R d6 , S(O)R b6 , S(O)NR c6 R d6 , S(O) 2 R b6 , NR c6 S(O) 2 R b6 , NR c6 S(O) 2 NR c6 R d6 , and S(O) 2 NR c6 R d6 ;

or any R c and R d together with the N atom to which they are attached form a 4-, 5-, 6-, or 7-membered heterocycloalkyl group optionally substituted with 1, 2, or 3 substituents independently selected from C 1-6 alkyl, C 3-7 cycloalkyl, 4-7 membered heterocycloalkyl, C 6-10 aryl, 5-6 membered heteroaryl, C 1-6 haloalkyl, halo, CN, OR a6 , SR a6 , C(O)R b6 , C(O)NR c6 R d6 , C(O)OR a6 , OC(O)R b6 , OC(O)NR c6 R d6 , NR c6 R d6 , NR c6 C(O)R b6 , NR c6 C(O)NR c6 R d6 , NR c6 C(O)OR a6 , C(═NR e6 )NR c6 R d6 , NR c6 C(═NR e6 )NR c6 R d6 , S(O)R b6 , S(O)NR c6 R d6 , S(O) 2 R b6 , NR c6 S(O) 2 R b6 , NR c6 S(O) 2 NR c6 R d6 , and S(O) 2 NR c6 R d6 , wherein said C 1-6 alkyl, C 3-7 cycloalkyl, 4-7 membered heterocycloalkyl, C 6-10 aryl, and 5-6 membered heteroaryl are optionally substituted by 1, 2, or 3 substituents independently selected from halo, CN, OR a6 , SR a6 , C(O)R b6 , C(O)NR c6 R d6 , C(O)OR a6 , OC(O)R b6 , OC(O)NR c6 R d6 , NR c6 R d6 , NR c6 C(O)R b6 , NR c6 C(O)NR c6 R d6 , NR c6 C(O)OR a6 , C(═NR e6 )NR c6 R d6 , NR c6 C(═NR e6 )NR c6 R d6 , S(O)R b6 , S(O)NR c6 R d6 , S(O) 2 R b6 , NR c6 S(O) 2 R b6 , NR c6 S(O) 2 NR c6 R d6 , and S(O) 2 NR c6 R d6 ;

or any R c2 and R d2 together with the N atom to which they are attached form a 4-, 5-, 6-, or 7-membered heterocycloalkyl group optionally substituted with 1, 2, or 3 substituents independently selected from C 1-6 alkyl, C 3-7 cycloalkyl, 4-7 membered heterocycloalkyl, C 6-10 aryl, 5-6 membered heteroaryl, C 1-6 haloalkyl, halo, CN, OR a6 , SR a6 , C(O)R b6 , C(O)NR c6 R d6 , C(O)OR a6 , OC(O)R b6 , OC(O)NR c6 R d6 , NR c6 R d6 , NR c6 C(O)R b6 , NR c6 C(O)NR c6 R d6 , NR c6 C(O)OR a6 , C(═NR e6 )NR c6 R d6 , NR c6 C(═NR e6 )NR c6 R d6 , S(O)R b6 , S(O)NR c6 R d6 , S(O) 2 R b6 , NR c6 S(O) 2 R b6 , NR c6 S(O) 2 NR c6 R d6 , and S(O) 2 NR c6 R d6 , wherein said C 1-6 alkyl, C 3-7 cycloalkyl, 4-7 membered heterocycloalkyl, C 6-10 aryl, and 5-6 membered heteroaryl are optionally substituted by 1, 2, or 3 substituents independently selected from halo, CN, OR a6 , SR a6 , C(O)R b6 , C(O)NR c6 R d6 , C(O)OR a6 , OC(O)R b6 , OC(O)NR c6 R d6 , NR c6 R d6 , NR c6 C(O)R b6 , NR c6 C(O)NR c6 R d6 , NR c6 C(O)OR a6 , C(═NR e6 )NR c6 R d6 , NR c6 C(═NR e6 )NR c6 R d6 , S(O)R b6 , S(O)NR c6 R d6 , S(O) 2 R b6 , NR c6 S(O) 2 R b6 , NR c6 S(O) 2 NR c6 R d6 , and S(O) 2 NR c6 R d6 ;

or any R c3 and R d3 together with the N atom to which they are attached form a 4-, 5-, 6-, or 7-membered heterocycloalkyl group optionally substituted with 1, 2, or 3 substituents independently selected from C 1-6 alkyl, C 3-7 cycloalkyl, 4-7 membered heterocycloalkyl, C 6-10 aryl, 5-6 membered heteroaryl, C 1-6 haloalkyl, halo, CN, OR a6 , SR a6 , C(O)R b6 , C(O)NR c6 R d6 , C(O)OR a6 , OC(O)R b6 , OC(O)NR c6 R d6 , NR c6 R d6 , NR c6 C(O)R b6 , NR c6 C(O)NR c6 R d6 , NR c6 C(O)OR a6 , C(═NR e6 )NR c6 R d6 , NR c6 C(═NR e6 )NR c6 R d6 , S(O)R b6 , S(O)NR c6 R d6 , S(O) 2 R b6 , NR c6 S(O) 2 R b6 , NR c6 S(O) 2 NR c6 R d6 , and S(O) 2 NR c6 R d6 , wherein said C 1-6 alkyl, C 3-7 cycloalkyl, 4-7 membered heterocycloalkyl, C 6-10 aryl, and 5-6 membered heteroaryl are optionally substituted by 1, 2, or 3 substituents independently selected from halo, CN, OR a6 , SR a6 , C(O)R b6 , C(O)NR c6 R d6 , C(O)OR a6 , OC(O)R b6 , OC(O)NR c6 R d6 , NR c6 R d6 , NR c6 C(O)R b6 , NR c6 C(O)NR c6 R d6 , NR c6 C(O)OR a6 , C(═NR e6 )NR c6 R d6 , NR c6 C(═NR e6 )NR c6 R d6 , S(O)R b6 , S(O)NR c6 R d6 , S(O) 2 R b6 , NR c6 S(O) 2 R b6 , NR c6 S(O) 2 NR c6 R d6 , and S(O) 2 NR c6 R d6 ;

or any R c5 and R d5 together with the N atom to which they are attached form a 4-, 5-, 6-, or 7-membered heterocycloalkyl group optionally substituted with 1, 2, or 3 substituents independently selected from C 1-6 alkyl, C 3-7 cycloalkyl, 4-7 membered heterocycloalkyl, C 6-10 aryl, 5-6 membered heteroaryl, C 1-6 haloalkyl, halo, CN, OR a6 , SR a6 , C(O)R b6 , C(O)NR c6 R d6 , C(O)OR a6 , OC(O)R b6 , OC(O)NR c6 R d6 , NR c6 R d6 , NR c6 C(O)R b6 , NR c6 C(O)NR c6 R d6 , NR c6 C(O)OR a6 , C(═NR e6 )NR c6 R d6 , NR c6 C(═NR e6 )NR c6 R d6 , S(O)R b6 , S(O)NR c6 R d6 , S(O) 2 R b6 , NR c6 S(O) 2 R b6 , NR c6 S(O) 2 NR c6 R d6 , and S(O) 2 NR c6 R d6 , wherein said C 1-6 alkyl, C 3-7 cycloalkyl, 4-7 membered heterocycloalkyl, C 6-10 aryl, and 5-6 membered heteroaryl are optionally substituted by 1, 2, or 3 substituents independently selected from halo, CN, OR a6 , SR a6 , C(O)R b6 , C(O)NR c6 R d6 , C(O)OR a6 , OC(O)R b6 , OC(O)NR c6 R d6 , NR c6 R d6 , NR c6 C(O)R b6 , NR c6 C(O)NR c6 R d6 , NR c6 C(O)OR a6 , C(═NR e6 )NR c6 R d6 , NR c6 C(═NR e6 )NR c6 R d6 , S(O)R b6 , S(O)NR c6 R d6 , S(O) 2 R b6 , NR c6 S(O) 2 R b6 , NR c6 S(O) 2 NR c6 R d6 , and S(O) 2 NR c6 R d6 ;

each R e , R e1 , R e3 , and R e5 is independently selected from H, C 1-4 alkyl, CN, OR a6 , SR b6 , S(O) 2 R b6 , C(O)R b6 , S(O) 2 NR c6 R d6 , and C(O)NR c6 R d6 ;

each R a6 , R b6 , R c6 , and R d6 is independently selected from H, C 1-4 alkyl, C 1-4 haloalkyl, C 2-4 alkenyl, and C 2-4 alkynyl, wherein said C 1-4 alkyl, C 2-4 alkenyl, and C 2-4 alkynyl, is optionally substituted with 1, 2, or 3 substituents independently selected from OH, CN, amino, halo, C 1-4 alkyl, C 1-4 alkoxy, C 1-4 alkylthio, C 1-4 alkylamino, di(C 1-4 alkyl)amino, C 1-4 haloalkyl, and C 1-4 haloalkoxy;

or any R c6 and R d6 together with the N atom to which they are attached form a 4-, 5-, 6-, or 7-membered heterocycloalkyl group optionally substituted with 1, 2, or 3 substituents independently selected from OH, CN, amino, halo, C 1-4 alkyl, C 1-4 alkoxy, C 1-4 alkylthio, C 1-4 alkylamino, di(C 1-4 alkyl)amino, C 1-4 haloalkyl, and C 1-4 haloalkoxy; and

each R e6 is independently selected from H, C 1-4 alkyl, and CN.

2. The method of claim 1 , wherein L is CH 2 .

3. The method of claim 1 , wherein Cy is C 6-10 aryl, C 3-10 cycloalkyl, or 5-10 membered heteroaryl, each of which is optionally substituted by 1, 2, or 3 R Cy .

4. The method of claim 1 , wherein Cy is phenyl, cyclopentyl, quinolinyl, or pyridyl, each of which is optionally substituted by 1, 2, or 3 R Cy .

5. The method of claim 1 , wherein Cy is phenyl optionally substituted by 1, 2, or 3 R Cy .

6. The method of claim 1 , wherein each R Cy is independently selected from halo, C 1-6 alkyl, C 1-4 haloalkyl, (4-10 membered heterocycloalkyl)-C 1-4 alkyl, CN, OR a3 , C(O)NR c3 R d3 , NR c3 C(O)R b3 , and NR c3 C(O)NR c3 R d3 wherein said C 1-6 alkyl and (4-10 membered heterocycloalkyl)-C 1-4 alkyl are each optionally substituted with 1, 2, or 3 substituents independently selected from halo, C 1-6 alkyl, OR a3 , and NR c3 R d3 .

7. The method of claim 1 , wherein R 1 is H or C 1-6 alkyl.

8. The method of claim 1 , wherein R 1 is methyl.

9. The method of claim 1 , wherein R 2 and R 3 are both H.

10. The method of claim 1 , wherein R 5 is H.

11. The method of claim 1 , wherein the compound is a compound of Formula IVc:

12. The method of claim 1 , wherein the compound is 6-benzyl-1-methyl-6H-pyrazolo[3,4-e][1,2,4]triazolo[4,3-a]pyridine, or a pharmaceutically acceptable salt thereof.

13. The method of claim 1 , wherein the cancer is leukemia.

14. The method of claim 1 , wherein the cancer is lymphoma.

15. The method of claim 1 , wherein the cancer is multiple myeloma.

16. The method of claim 1 , wherein the cancer is brain cancer.

17. The method of claim 1 , wherein the cancer is neuroblastoma.

18. The method of claim 1 , wherein the cancer is carcinoma.

19. The method of claim 1 , wherein the cancer is skin cancer.

20. The method of claim 1 , wherein the cancer is lung cancer.

21. The method of claim 1 , wherein the cancer is prostate cancer.